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7050高強鋁合金孔板的擠壓強化與拉伸試驗研究
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航空基礎科學基金 (2011ZE53059)資助


Study of Local Cold Working and Tensile Test for 7050 High Strength Aluminum Alloy Hole Plate
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    摘要:

    針對航空用7050高強鋁合金的孔板件拉伸性能進行試驗研究與模擬分析，并對不同過盈量 (0%~11.11%) 的孔擠壓強化效果進行了對比分析。研究表明：孔板的表觀強度、延伸率和彈性模量均降低，但塑性失穩(wěn)點應變卻有很大程度的提高；孔擠壓強化提高了孔壁處材料的屈服強度，改善了孔表面的受力狀態(tài)，使得應力峰值得到鈍化，并擴大了孔壁沿厚度方向的平面應變范圍，因此拉伸斷口隨孔擠壓量的變化呈規(guī)律性的變化；孔擠壓強化后殘余拉、壓應力峰值隨擠壓量的增加而增加，且其峰值出現(xiàn)的部位隨擠壓量的增加而向遠離于孔壁的深處轉(zhuǎn)移

    Abstract:

    This paper mainly aims at 7050 aluminum alloy to study the tensile mechanical performance of the plate with hole through testing and finite-element simulation. Then the cold working effects of different interferences (ranging from 0% to 11.11%) were compared and analyzed. Results show that compared with the standard specimens of 7050 aluminum alloy, for the plates with holes, their apparent strength, coefficient of elongation and modulus of elasticity are reduced, but the strains at plastic instability points are improved to a large extent. Cold working enhances the yield strength of the material around hole wall and improves the stress state of hole surface which make for peak stress weakened and enlarge the plane strain range along thickness direction of the hole. Meanwhile, the change of the tensile fracture with the cold working deformation degree present a regularity. Residual stress increases with interference increasing, and the position of peak stress transfers far from the wall of the hole along radial direction with interference increasing

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范 娟,李付國,李 江,王少剛.7050高強鋁合金孔板的擠壓強化與拉伸試驗研究[J].稀有金屬材料與工程,2012,41(6):978~982.[Fan Juan, Li Fuguo, Li Jiang, Wang Shaogang. Study of Local Cold Working and Tensile Test for 7050 High Strength Aluminum Alloy Hole Plate[J]. Rare Metal Materials and Engineering,2012,41(6):978~982.]
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  • 收稿日期:2011-06-26
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